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<?xml version="1.0" encoding='UTF-8'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
<refentry id="pam_wheel">
<refmeta>
<refentrytitle>pam_wheel</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
</refmeta>
<refnamediv id="pam_wheel-name">
<refname>pam_wheel</refname>
<refpurpose>Only permit root access to members of group wheel</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis id="pam_wheel-cmdsynopsis">
<command>pam_wheel.so</command>
<arg choice="opt">
debug
</arg>
<arg choice="opt">
deny
</arg>
<arg choice="opt">
group=<replaceable>name</replaceable>
</arg>
<arg choice="opt">
root_only
</arg>
<arg choice="opt">
trust
</arg>
<arg choice="opt">
use_uid
</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id="pam_wheel-description">
<title>DESCRIPTION</title>
<para>
The pam_wheel PAM module is used to enforce the so-called
<emphasis>wheel</emphasis> group. By default it permits root
access to the system if the applicant user is a member of the
<emphasis>wheel</emphasis> group. If no group with this name exist,
the module is using the group with the group-ID
<emphasis remap='B'>0</emphasis>.
</para>
</refsect1>
<refsect1 id="pam_wheel-options">
<title>OPTIONS</title>
<variablelist>
<varlistentry>
<term>
<option>debug</option>
</term>
<listitem>
<para>
Print debug information.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>deny</option>
</term>
<listitem>
<para>
Reverse the sense of the auth operation: if the user
is trying to get UID 0 access and is a member of the
wheel group (or the group of the <option>group</option> option),
deny access. Conversely, if the user is not in the group, return
PAM_IGNORE (unless <option>trust</option> was also specified,
in which case we return PAM_SUCCESS).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>group=<replaceable>name</replaceable></option>
</term>
<listitem>
<para>
Instead of checking the wheel or GID 0 groups, use
the <option><replaceable>name</replaceable></option> group
to perform the authentication.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>root_only</option>
</term>
<listitem>
<para>
The check for wheel membership is done only when the target user
UID is 0.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>trust</option>
</term>
<listitem>
<para>
The pam_wheel module will return PAM_SUCCESS instead
of PAM_IGNORE if the user is a member of the wheel group
(thus with a little play stacking the modules the wheel
members may be able to su to root without being prompted
for a passwd).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>use_uid</option>
</term>
<listitem>
<para>
The check for wheel membership will be done against
the current uid instead of the original one (useful when
jumping with su from one account to another for example).
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="pam_wheel-types">
<title>MODULE TYPES PROVIDED</title>
<para>
The <emphasis remap='B'>auth</emphasis> and
<emphasis remap='B'>account</emphasis> module types are provided.
</para>
</refsect1>
<refsect1 id='pam_wheel-return_values'>
<title>RETURN VALUES</title>
<variablelist>
<varlistentry>
<term>PAM_AUTH_ERR</term>
<listitem>
<para>
Authentication failure.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_BUF_ERR</term>
<listitem>
<para>
Memory buffer error.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_IGNORE</term>
<listitem>
<para>
The return value should be ignored by PAM dispatch.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_PERM_DENY</term>
<listitem>
<para>
Permission denied.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_SERVICE_ERR</term>
<listitem>
<para>
Cannot determine the user name.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_SUCCESS</term>
<listitem>
<para>
Success.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_USER_UNKNOWN</term>
<listitem>
<para>
User not known.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id='pam_wheel-examples'>
<title>EXAMPLES</title>
<para>
The root account gains access by default (rootok), only wheel
members can become root (wheel) but Unix authenticate non-root
applicants.
<programlisting>
su auth sufficient pam_rootok.so
su auth required pam_wheel.so
su auth required pam_unix.so
</programlisting>
</para>
</refsect1>
<refsect1 id='pam_wheel-see_also'>
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>
</para>
</refsect1>
<refsect1 id='pam_wheel-author'>
<title>AUTHOR</title>
<para>
pam_wheel was written by Cristian Gafton <gafton@redhat.com>.
</para>
</refsect1>
</refentry>
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